Book ChapterDOI
Impact of Thermal Contact Resistance on Thermal-Hydraulic Characteristics of Double Fin-and-Tube Heat Exchanger
Shobhana Singh,N. K. Dwivedi +1 more
- pp 187-197
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TLDR
In this paper, the thermal contact resistance in a double fin-and-tube heat exchanger was investigated using multiphysics numerical approach, and it was found that contact resistance of 3.3 × 106 Km2/W can reduce the overall performance by approximately 6% when compared without thermal resistance at the contact interface.Abstract:
In the present work, the thermal contact resistance in a double fin-and-tube heat exchanger is investigated using multiphysics numerical approach. A three-dimensional (3D) Computational Fluid Dynamic (CFD) model is constructed in commercial software COMSOL Multiphysics® by coupling steady-state conjugate heat transfer and turbulent fluid flow. The impact of contact resistance at the fin and tube interface is analyzed by quantitatively evaluating the thermal-hydraulic characteristics. It is found that contact resistance of 3.3 × 106 Km2/W can reduce the overall performance by approximately 6% when compared without thermal resistance at the contact interface. The developed model can predict the effectiveness of the fin-and-tube heat exchanger design with or without thermal contact resistances. Furthermore, the model can be employed to improve the overall heat exchanger performance used in various applications.read more
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Journal ArticleDOI
Thermal performance criteria of elliptic tube bundle in crossflow
Talaat A. Ibrahim,Abdalla Gomaa +1 more
TL;DR: In this article, the authors investigated the thermofluid characteristics of the elliptic tube bundle in crossflow and showed that increasing the angle of attack clockwise until 90° enhances the convective heat transfer coefficient considerably.
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Effect of geometrical parameters on heat transfer and pressure drop characteristics of plate fin and tube heat exchangers
TL;DR: In this paper, the influence of fin geometry on heat transfer and pressure drop of a plate fin and tube heat exchanger is investigated numerically using a computational fluid dynamics (CFD) program.
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A comparative study of elliptical and circular sections in one- and two-row tubes and plate fin heat exchangers
TL;DR: In this article, a two-dimensional (2D) heat transfer analysis is performed in one-and two-row tubes and plate fin heat exchangers (circular and elliptical sections), using experimentally determined heat transfer coefficients from a heat and mass transfer analogy.
Journal ArticleDOI
Thermal contact resistance in plate fin-and-tube heat exchangers, determined by experimental data and CFD simulations
Dawid Taler,Paweł Ocłoń +1 more
TL;DR: In this paper, a modified method for estimating the mean value of thermal contact resistance in a plate fin-and-tube heat exchanger is presented, based on the CFD simulations and experimental measurements.
Journal ArticleDOI
A three-dimensional numerical study and comparison between the air side model and the air/water side model of a plain fin-and-tube heat exchanger
TL;DR: In this article, the authors present an enhanced model, whose innovation lies in considering additionally the water flow in the tubes and the conduction heat transfer through the fin and tubes, to demonstrate that the neglect of these two phenomena causes a simulation result accuracy reduction.